Change mod_include to use the latest bucket API tricks. This gets

rid of some obscure while loop magic that had to be done before,
making mod_include easier to read and a better example for future
filter writers.

There should be no semantic changes in this patch... just a 1-to-1
mapping from while loops to bucket API calls that do the same thing.

Reviewed by:	Paul J. Reder


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@88906 13f79535-47bb-0310-9956-ffa450edef68